ASoC: ad1836: reset and restore clock control mode in suspend/resume entry
tests show frequent suspend/resume(frequent poweroff/on ad1836 internal
components) maybe make ad1836 clock mode wrong sometimes after wakeup.
This patch reset/restore ad1836 clock mode while executing PM, then
ad1836 can always resume to right clock status.
Signed-off-by: Barry Song <21cnbao@gmail.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/codecs/ad1836.c b/sound/soc/codecs/ad1836.c
index 2c18e3d..83add2f 100644
--- a/sound/soc/codecs/ad1836.c
+++ b/sound/soc/codecs/ad1836.c
@@ -223,6 +223,36 @@
return reg_cache[reg];
}
+#ifdef CONFIG_PM
+static int ad1836_soc_suspend(struct platform_device *pdev,
+ pm_message_t state)
+{
+ struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+ struct snd_soc_codec *codec = socdev->card->codec;
+
+ /* reset clock control mode */
+ u16 adc_ctrl2 = codec->read(codec, AD1836_ADC_CTRL2);
+ adc_ctrl2 &= ~AD1836_ADC_SERFMT_MASK;
+
+ return codec->write(codec, AD1836_ADC_CTRL2, adc_ctrl2);
+}
+
+static int ad1836_soc_resume(struct platform_device *pdev)
+{
+ struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+ struct snd_soc_codec *codec = socdev->card->codec;
+
+ /* restore clock control mode */
+ u16 adc_ctrl2 = codec->read(codec, AD1836_ADC_CTRL2);
+ adc_ctrl2 |= AD1836_ADC_AUX;
+
+ return codec->write(codec, AD1836_ADC_CTRL2, adc_ctrl2);
+}
+#else
+#define ad1836_soc_suspend NULL
+#define ad1836_soc_resume NULL
+#endif
+
static int __devinit ad1836_spi_probe(struct spi_device *spi)
{
struct snd_soc_codec *codec;
@@ -404,6 +434,8 @@
struct snd_soc_codec_device soc_codec_dev_ad1836 = {
.probe = ad1836_probe,
.remove = ad1836_remove,
+ .suspend = ad1836_soc_suspend,
+ .resume = ad1836_soc_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_ad1836);